Limit Switches

Limit switches are a contact proximity sensor device that consists of an actuator mechanically linked to a set of output contacts. When an object comes into contact with the actuator, the device operates the contacts to make or break an electrical connection.

Limit Switch Makeup

Limit switches are made up of three key components:
•Actuator Head - The actuator is the part of the switch that makes physical contact with the object. In some limit switches, the actuator is attached to an operating head which translates a rotary, linear, or perpendicular motion to open or close the electrical contacts of the switch.


•Switch Body – The switch body is the component containing the electrical contact mechanism, the contacts within the body open or close the electrical circuit when the actuator is activated.


•Receptacle/Terminals - The component containing the terminal screws or screw/clamp assembly necessary for wiring purposes.



Actuator Types

Limit switches are available with a wide range of actuator types. The type of actuator used can be determined by the mounting position, force required and objects to be detected.
•Rotary Lever - with lever actuators, a cam or plate hits the end of the lever arm which in turn rotates a shaft and operates the contacts in the switch. The rotation may be spring returned (momentary) or maintained.


•Plunger - Plunger types are best where short controlled machine movements are present or where mounting space does not permit a lever type.


•Cat Whisker or Coil Spring – Longer actuators with a coil wire that can be moved/bent in multiple directions. Typically used in conveying applications to count objects as they pass by.


•Forked – Used with maintained contacts, consisting of two roller levers. One roller will trip the switch and when the second is moved to the opposite direction it will reset the switch.

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Description Price Actuator Type Pole and Throw Configuration Normal State Configuration IP Rating Maximum Current Housing Material Maximum AC Voltage Maximum DC Voltage Connection Type Contact Type Series Terminal Type Length Width
RS庫存編號 843-1288
製造零件編號AT0-11-S-IA/F
BrandEaton
HK$602.37
單位
Coil Spring - NO/NC IP65 10 A Plastic 415V 220V - Quick Break AT0 Screw - -
RS庫存編號 843-1213
製造零件編號AT4/11-S/I/AR
BrandEaton
HK$662.84
單位
Roller Lever - NO/NC IP65 10 A Plastic 415V 220V - Quick Break AT4 Screw - -
RS庫存編號 843-1250
製造零件編號AT0-11-1-IA
BrandEaton
HK$372.70
單位
Plunger - NO/NC IP65 10 A Plastic 415V 220V - Slow Action AT0 Screw - -
RS庫存編號 843-1257
製造零件編號AT0-11-1-IA/ZS
BrandEaton
HK$542.85
單位
Plunger - NO/NC IP65 10 A Plastic 415V 220V - Slow Action AT0 Screw - -
RS庫存編號 843-1275
製造零件編號AT0-11-S-IA
BrandEaton
HK$372.70
單位
Plunger - NO/NC IP65 10 A Plastic 415V 220V - Slow Action AT0 Screw - -
RS庫存編號 308-272
製造零件編號LS-11S
BrandEaton
HK$199.17
單位
Plunger - NO/NC IP66, IP67 6 A Plastic 415V 220V Cage Clamp Snap Action LS-Titan Screw 76mm 33.5mm
RS庫存編號 478-1359
製造零件編號LSM-02
BrandEaton
HK$218.50
單位
Plunger - 2NC IP66, IP67 6 A Metal 415V 220V Cage Clamp Standard Action LS-Titan Screw 76mm 33.5mm
RS庫存編號 843-1196
製造零件編號AT4/11-1/I/AR
BrandEaton
HK$750.04
單位
Roller Lever - NO/NC IP65 10 A Plastic 415V 220V - Slow Action AT4 Screw - -
RS庫存編號 478-1393
製造零件編號LSM-11S
BrandEaton
HK$210.61
單位
Plunger - NO/NC IP66, IP67 6 A Metal 415V 220V Cage Clamp Snap Action LS-Titan Screw 76mm 33.5mm
RS庫存編號 308-250
製造零件編號LS-20
BrandEaton
HK$184.00
單位
Plunger - 2NO IP66, IP67 6 A Plastic 415V 220V Cage Clamp Standard Action LS-Titan Screw 76mm 33.5mm
RS庫存編號 843-1294
製造零件編號AT0-20-1-IA
BrandEaton
HK$420.61
單位
Plunger - 2NO IP65 10 A Plastic 415V 220V - Slow Action AT0 Screw - -
RS庫存編號 478-1365
製造零件編號LSM-11
BrandEaton
HK$258.63
單位
Plunger SPDT NO/NC IP66, IP67 6 A @ 24 V Metal 415V 220V Cage Clamp Standard Action LS-Titan Screw 76mm 31mm
RS庫存編號 123-6419
製造零件編號LS-11-CC
BrandEaton
HK$262.16
單位
Plunger SPST-NC, SPST-NO NO/NC IP65 3 A @ 24 V dc, 6 A @ 24 V ac Cold Climate Insulated Plastic 415V 220V Cage Clamp Snap Action LS-Titan - 31mm 33.5mm
RS庫存編號 308-238
製造零件編號LSE-11
BrandEaton
HK$449.00
單位
Plunger - NO/NC IP66, IP67 200 mA Plastic - 30V Cage Clamp Standard Action LS-Titan Screw 76mm 33.5mm
RS庫存編號 843-1266
製造零件編號AT0-11-2-IA
BrandEaton
HK$372.70
單位
Plunger - NO/NC IP65 10 A Plastic 415V 220V - Slow Action AT0 Screw - -
RS庫存編號 843-1216
製造零件編號AT4/11-1/I/V
BrandEaton
HK$880.63
單位
Adjustable Roller Lever - NO/NC IP65 10 A Plastic 415V 220V - Slow Action AT4 Screw - -
RS庫存編號 123-6426
製造零件編號LS-S11DA-CC
BrandEaton
HK$262.16
單位
Plunger SPST-NC, SPST-NO NO/NC IP65 3 A @ 24 V dc, 6 A @ 24 V ac Cold Climate Insulated Plastic 415V 220V Screw Snap Action LS-Titan - 31mm 33.5mm
RS庫存編號 847-4998
製造零件編號LS-S11-ZB
BrandEaton
HK$900.95
單位
Key - NO/NC IP65 3 A @ 24 V dc, 10 A @ 24 V ac - 415V 220V Cable Standard Action - Screw 60mm 173mm
RS庫存編號 123-6425
製造零件編號LS-11DA-CC
BrandEaton
HK$262.16
單位
Plunger SPST-NC, SPST-NO NO/NC IP65 3 A @ 24 V dc, 6 A @ 24 V ac Cold Climate Insulated Plastic 415V 220V Cage Clamp Snap Action LS-Titan - 31mm 33.5mm
RS庫存編號 111-6031
製造零件編號LSM-20A
BrandEaton
HK$225.35
單位
Plunger DPST 2NO IP66, IP67 3 A @ 24 V dc, 6 A @ 240 V ac Metal 400/415V 220V Cage Clamp - LS-Titan M20 Connector, Screw 31mm 76mm